Thanks so much Jed for your prompt response. I will start experimenting with all the suggestions.
Best, Mohamad On Thu, Dec 22, 2011 at 5:31 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote: > On Thu, Dec 22, 2011 at 19:20, Mohamad M. Nasr-Azadani <mmnasr at > gmail.com>wrote: > >> Any hints on what is happening here or how I could narrow it down? > > > I would start by following the general advice in the FAQ > > http://www.mcs.anl.gov/petsc/documentation/faq.html#kspdiverged > > >> I know that we had an early discussion on the convergnce for the >> incompressible CFD problems and boomerAMG preconditioning, > > > That was about solving the coupled system. That shouldn't be an issue for > the Poisson problem. > > >> but it seems that for this case, that is the only one that does not blow >> up for most of the time integration I have. > > > Since this problem only occurs after long time integration, you might > consider writing out the model state when you see divergence so that you > can experiment with alternative methods quickly. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111222/e910c009/attachment.htm>
